343 documents found, page 1 of 35

Tracking Oil Price Shocks and Airline Stock Reactions Using Entropy-Based Appro...

The relationship between oil prices and the airline industry is economically important yet empirically complex, presenting significant challenges, with prior research yielding conflicting evidence on the nature, strength, and direction of their interaction. This study contributes to the literature moving beyond traditional linear assumptions, applying Shannon and R´enyi transfer entropy to evaluate the nonlinea...

Risk without borders: a transfer entropy analysis of geopolitical spillovers in...

Abstract How geopolitical risk affects stock markets in low and lower-middle-income countries remains an area often overlooked. This study analyzes daily data from 2014 to 2025 for 16 stock markets and two geopolitical risk subindices, acts and threats. The transfer entropy is applied in a dynamic framework to measure asymmetric and time-varying information flows. The findings reveal a heterogeneous influence o...

Are European banks informationally weak-form efficient? A dynamic analysis

The efficient market hypothesis (EMH) is a cornerstone of financial theory and is crucial to understanding weak-form efficiency, particularly during extreme events. Detrended fluctuation analysis (DFA) is a robust approach for assessing weak-form efficiency, overcoming some limitations of traditional methods. Given the fundamental role of the banking sector in the economy and its importance during crises, evalu...

Tracking oil price shocks and airline stock reactions using entropy-based appro...

The relationship between oil prices and the airline industry is economically important yet empirically complex, presenting significant challenges, with prior research yielding conflicting evidence on the nature, strength, and direction of their interaction. This study contributes to the literature moving beyond traditional linear assumptions, applying Shannon and Rényi transfer entropy to evaluate the nonlinear...

Contribuição para a melhoria da cartografia geológica da Bacia Carbonífera do B...

RESUMO: A revisão da cartografia geológica da área onde se situa a Bacia Carbonífera do Buçaco (BCB) mostrou que os seus limites se encontram ou fortemente tectonizados ou em discordância angular sobre litologias neoproterozóicas e paleozóicas. Os sedimentos mesocenozóicos cartografados também estabelecem limites com as unidades da BCB. No limite oriental da bacia foi identificada uma falha normal gerada em reg...

Integração da atividade física e exercício físico nos currículos do ensino em e...

A inatividade física (IF) é um fator de risco para doenças crónicas não transmissíveis (DCNT), enquanto a prática regular de atividade física (AF) previne e reduz estas condições (WHO, 2020). Em Portugal, a adesão à AF é baixa: 73% nunca praticam exercício físico (EF) e apenas 22% são fisicamente ativos (EU, 2022). Os enfermeiros integrados em equipas multiprofissionais, são essenciais para promover a AF, funçã...

Smart Pill Dispenser for Children - An EPS@ISEP 2024 Project

People around the globe struggle with health issues requiring regular medication. Children, in particular, suffer more and more from chronic illnesses. In 2024, a team of six EPS@ISEP students chose to design a solution for this problem, followed by the assembly and testing of the corresponding proof-of-concept prototype. The aim was to design a solution for children to take the right medication, at the right t...

Breeding endangered beetles - An EPS@ISEP 2024 Project

Habitat loss, climate change, and pesticide use are key threats affecting beetle populations. This paper describes Scarabreed, a project that contributes to mitigate the beetle decline crisis. It was carried out by a team of six European students from different engineering fields and nationalities within the European Project Semester (EPS) at the Instituto Superior de Engenharia do Porto (ISEP), a project-based...

Algae and Fish Farming: An EPS@ISEP 2022 Project

The European Project Semester (EPS) at Instituto Superior de Engenharia do Porto (ISEP) is a capstone engineering design program where students, organised in multidisciplinary and multicultural teams, create a solution for a proposed problem, bearing in mind ethical, sustainability and market concerns. The project proposals are usually aligned with the United Nations Sustainable Development Goals (SDG). New sus...

Impacto da Educação no Desenvolvimento Sustentável: Uma Análise Territorial com...